Dinuclear alkoxo-bridged copper(II) coordination polymers: Syntheses, structural and magnetic properties
作者:Petri Seppälä、Enrique Colacio、Antonio J. Mota、Reijo Sillanpää
DOI:10.1016/j.ica.2009.11.035
日期:2010.3
The alkoxo-bridged dinuclear copper(II) complexes [Cu-2(ap)(2)(NO2)(2)] (1), [Cu-2(ap)(2)(C6H5COO)(2)] (2) and [Cu-2(ap)(2)mu-1,3-C6H4(COO)(2)(dmso)(2)]center dot dmso (3) (ap = 3-aminopropanolato and dmso = dimethyl sulfoxide) have been synthesized via self-assembly from copper(II) perchlorate, 3-aminopropanol as main chelating ligand and nitrite and isophthalate anions as spacers and benzoate anion as auxiliary ligand. Complexes 1 and 3 crystallize as 2D and 1D coordination polymers, respectively, and their structures consist of dinuclear [Cu-2(ap)(2)](2+) units connected with nitrite and isophthalate ligands. The adjacent dinuclear units of 2 and 1D polymers of 3 are further connected by hydrogen bonds resulting in the formation of 2D layers. The variable temperature crystallographic measurements of 1 at 100, 173 and 293 K indicate the static Jahn-Teller distortion with librational disorder in the nitrite group. Experimental magnetic studies showed that complexes 1-3 exhibit strong antiferromagnetic couplings. The values of the magnetic exchange coupling constant for 1-3 are well reproduced by the theoretical calculations. (C) 2009 Elsevier B. V. All rights reserved.